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Mono vs discrete multichannel audio for archiving purposes

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Paul Guarri
Mono vs discrete multichannel audio for archiving purposes
on Oct 26, 2017 at 9:39:43 am

Hi,
I'm exporting a video from Premiere.
I already delivered the single versions with their proper mix and I want to create a master file with all the mixes for archiving purposes.

I created a multichannel sequence with 12 tracks.

Tracks 1 to 6 are surround mono tracks (L R C Lfe Ls Rs), 7-8 broadcast mix L and R, home video mix L & R etc...
When I export from premiere I have the choice to export the multichannel sequence as "mono" or "discrete"...

What's the difference between the two options? There's some advantage/disadvantage choosing one or another?

I watched some tutorial and everyone seems to choose the "mono" option...


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John Pale
Re: Mono vs discrete multichannel audio for archiving purposes
on Oct 26, 2017 at 12:50:49 pm

I’ve wondered that myself. I examined and compared files encoded using both settings and they appear and behave identically.


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Paul Guarri
Re: Mono vs discrete multichannel audio for archiving purposes
on Oct 26, 2017 at 2:02:03 pm

In fact, I tested them on different editing systems and they behave the same.
The only difference I see is in the metadata of the file.

If I look at the file info in QuickTime for the audio I see:

Discrete version: 12 discrete channels
Mono multichannel version: 12 channel (mono)

and in MediaInfo:

Discrete version: 12 channels - channel mapping: discrete-0 sicrete-1 etc...
Mono multichannel version: 12 channels - channel mapping: ? ? ? etc...

I'm still trying to guess what's the difference in practical terms.


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Peter Garaway
Re: Mono vs discrete multichannel audio for archiving purposes
on Oct 26, 2017 at 9:44:02 pm

Hi Paul,

I think you're pretty much spot on. I don't believe there's a difference. I'll let you know if I find out any more. What I've been told is, the setting is how the metadata is handled in the file. Mono is treated as Mono, meaning that certain playback systems will play it out over each speaker. Discrete means that there is no channel information added (i.e., unlabeled).

Hopefully, that's (kinda) helpful?

Peter Garaway
Adobe


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